.right-tools {
    position: fixed;
    right: 0;
    bottom: 70px;
}

.right-tools>ul.return-top {
    margin-top: 14px;
    display: none;
}

.right-tools>ul>li {
    width: 82px;
    height: 90px;
    border: 1px solid #f5f5f5;
    background-color: #FFFFFF;
}

.right-tools>ul>li>a>div {
    width: 30px;
    height: 30px;
    margin: 0 auto 8px;
    padding-top: 18px;
}

.right-tools>ul>li>a>div>img {
    width: 30px;
    height: 30px;
    position: absolute;
    opacity: 1; /* 初始状态：显示 */
}

.right-tools>ul>li:hover>a>div>img {
    opacity: 0; /* 悬停时：隐藏 */
}

.right-tools>ul>li>a>div>img:last-child {
    opacity: 0; /* 初始状态：隐藏 */
}

.right-tools>ul>li:hover>a>div>img:last-child {
    opacity: 1; /* 悬停时：显示 */
}

.right-tools>ul>li>a>p {
    text-align: center;
    color: #757575;
}

.right-tools>ul>li:hover>a>p {
    color: #FF6700;
}